- Network:
- SSE to push room and last message
- Share Connection Across Multiple Tabs: SharedWorker
- Heartbeat to disconnect inactive connection
- WebP / AVIF to reduce image size, good for preview but not good for download and following editing
- Performance:
- Add Message Status, Support Optimistic Update and Failed Message Retry: Map Data Structure + IndexedDB
- Virtual List to render message
- Lazy Loading to render e.g. emoji picker, any popovers/modals
- Cursor based optimization to load more messages